ambassador to libya and three others. >> we are going to bring those who killed our fellow americans to justice. [ cheering and applause ] i want people around the world to hear me to all those who would do us harm, no act of terror will go unpunished. >> reporter: embassies in egypt and yemen scorned burning flags with threats against america. >> i don't have any speck information on report coming out of libya that there have been arrests. what i would say to that point is the libyans have expressed their concern over what happened. >> reporter: meanwhile we are learning more about the americans who died alongside ambassador christopher stevens. one of those men 42-year-old glenn doherty, a former navy seal whose family says he lived life to the fullest. >> he was my brother, but if you ask his friends, he was their brother as well. we ask for privacy during this time as we grieve for our friend, my brother, our brother, our son and our american hero. >> reporter: militants say the protest happened in response to an online video depicting the prophet muhammad in an unfavorable light